feat: add blowfish2 128 bit implementation

- regular blowfish only uses 64 bits
- blowfish2 uses 128 bits like AES

Signed-off-by: Avinal Kumar <avinal.xlvii@gmail.com>

include/blowfish/blowfish.h

@@ -1,19 +1,17 @@
-/*
- * @file blowfish.hpp
- * @author Avinal Kumar
- * @since February 15, 2021
- *
- * Blowfish Algorithm Header File
- */
+// SPDX-FileCopyrightText: 2024 Avinal Kumar avinal.xlvii@gmail.com
+// SPDX-License-Identifier: MIT
+
+// Original Blowfish Algorithm copyright:
+// SPDX-FileCopyrightText: 1997 Paul Kocher
 
 #include <algorithm>
 #include <array>
+#include <cstdint>
 #include <string>
 
 #define MAXKEYBYTES 56 // 448 bits max
 #define N 16
 
-
 #if !defined(BLOWFISH_BLOWFISH_H_)
 #define BLOWFISH_BLOWFISH_H_
 

include/blowfish/blowfish2.h

@@ -0,0 +1,35 @@
+// SPDX-FileCopyrightText: 2024 Avinal Kumar avinal.xlvii@gmail.com
+// SPDX-License-Identifier: MIT
+
+// Original Blowfish 2 Algorithm copyright:
+// SPDX-FileCopyrightText: 2005 Alexander Pukall
+
+#include <algorithm>
+#include <array>
+#include <cstdint>
+#include <string>
+
+#define MAXKEYBYTES 56 // 4224 bits max
+#define N 64
+
+#if !defined(BLOWFISH_BLOWFISH2_H_)
+#define BLOWFISH_BLOWFISH2_H_
+
+class Blowfish2 {
+private:
+  std::array<uint64_t, N + 2> PArray;
+  std::array<std::array<uint64_t, 256>, 8> Sboxes;
+  uint64_t F(uint64_t x);
+
+public:
+  Blowfish2() {}
+  Blowfish2(std::string const &key);
+  Blowfish2(Blowfish2 const &) = delete;
+
+  void initialize(std::string const &key);
+
+  void encrypt(uint64_t &xl, uint64_t &xr);
+  void decrypt(uint64_t &xl, uint64_t &xr);
+};
+
+#endif // BLOWFISH_BLOWFISH2_H_